simple-acme-dns 1.0.2

A Python ACME client for the DNS-01 challenge

simple_acme_dns

simple_acme_dns is a pure-Python ACME client specifically tailored to the DNS-01 challenge. This makes it easy to manage ACME certificates and accounts without the need for an external tool like certbot. Although this module is intended for use with Let's Encrypt, it will support any CA utilizing the ACME v2 protocol.

Sub-modules

• simple_acme_dns.errors
• simple_acme_dns.tools

Classes

ACMEClient(domains=None, email=None, directory=None, nameservers=None, new_account=False, generate_csr=False) : A basic ACME client object to interface with a CA using the ACME DNS-01 challenge.

• :var certificate [bytes]: the PEM formatted certificate. This value is populated after successfully running the request_certificate() methood.

• :var private_key [bytes]: the PEM formatted private key. This value is populated after successfully running the generate_private_key() method.

• :var csr [bytes]: the PEM formatted certificate signing request. This value is populated after successfully running the generate_csr() method.

• :param domains [list]: FQDNs to list in the certificate (SANS).

• :param email [str]: a valid email address to register new ACME accounts with.

• :param directory [str]: the ACME directory URL.

• :param nameservers [list]: nameservers to use when querying DNS. Defaults to system nameservers.

• :param new_account [bool]: automatically register a new account upon object creation. A directory and email value will be required if True.

• :param generate_csr [bool]: generate a new private key and CSR upon object creation. A domains value will be required if True.

Example:

>>> import simple_acme_dns
>>> client = simple_acme_dns.ACMEClient(
...     domains=["test1.example.com", "test2.example.com"],
...     email="[e-mail]",
...     directory="https://acme-staging-v02.api.letsencrypt.org/directory",
...     nameservers=["8.8.8.8", "1.1.1.1"],
...     new_account=True,
...     generate_csr=True
... )

---

Static methods

load_account(json_data) : Loads an existing account from a JSON data string created by the export_account() method.

• :param json_data [str]: the JSON account data string.

• :return [ACMEClient]: the loaded ACMEClient object.

Example

>>> client = simple_acme_dns.ACMEClient.load_account('{"account": {"body": {"key": {"n": "vtByzpW..."}}}}')

---

load_account_from_file(filepath) : Loads an existing account from a JSON file created by the export_account_to_file() method.

• :param filepath [str]: the file path to the account JSON file.

• :return [ACMEClient]: the loaded ACMEClient object.

• :raises InvalidPath: when the file path of the account JSON or key does not exist.

Example

>>> client = simple_acme_dns.ACMEClient.load_account('/tmp/my_acme_account.json')

---

Methods

check_dns_propagation(self, timeout=300, interval=2, authoritative=False, round_robin=True, verbose=False) : Check's each of our domain's TXT record until the value matches it's verification token or until the timeout is reached. This method should be executed before executing the request_certificates() method. This method can take several minutes to complete, ensure you adjust the timeout value accordingly.

• :param timeout [int]: the amount of time (in seconds) to continue trying to verify the TXT records.

• :param interval [float]: the amount of time (in seconds) between DNS requests per domain.

• :param authoritative [bool]: identify and use the authoritative nameserver for each domain instead of the objects nameservers property values.

• :param round_robin [bool]: rotate between each nameserver instead of the default failover method.

• :param verbose [bool]: print DNS answers to the console.

• :return [bool]: indicates whether or not all of the domains correctly return their verification token in their TXT record.

Example

>>> client.nameservers = ["8.8.8.8", "1.1.1.1"]
>>> client.check_dns_propagation(
...     timeout=180,
...     interval=5,
...     authoritative=False,
...     round_robin=True,
...     verbose=False
... )
Token 'moY3Cd0...' for '_acme-challenge.test1.example.com' not found in [] via 8.8.8.8
Token 'O32-fd_...' for '_acme-challenge.test2.example.com' not found in [] via 8.8.8.8
Token 'moY3Cd0...' for '_acme-challenge.test1.example.com' not found in [] via 1.1.1.1
Token 'O32-fd_...' for '_acme-challenge.test2.example.com' found in ['O32-fd_...'] via 1.1.1.1
Token 'moY3Cd0...' for '_acme-challenge.test1.example.com' not found in [] via 8.8.8.8
Token 'moY3Cd0...' for '_acme-challenge.test1.example.com' not found in [] via 1.1.1.1
Token 'moY3Cd0...' for '_acme-challenge.test1.example.com' found in ['moY3Cd0...'] via 8.8.8.8
True

---

deactivate_account(self, delete=True) : Deactivates the current account registration. This action is irreversible.

• :param delete [bool]: indicate whether any associated account file on the local system should also be deleted after deactivation.

• :return [none]:

• :raises InvalidAccount: when account registration has not been set.

Example

>>> client.deactivate_account()

---

export_account(self, save_certificate=True, save_private_key=False) : Exports the object as a JSON string. This is useful when using a framework like Django and need to store account data as a string in the database.

• :param save_certificate [bool]: indicate whether the certificate should also be stored in the JSON string.

• :param save_private_key [bool]: indicate whether the private key should also be stored in the JSON string.

• :return [str]: the current object encoded as a JSON string.

• :raises InvalidAccount: when account registration has not been set.

• :raises InvalidDomain: when no valid domains are set.

Example

>>> client.export_account(save_certificate=True, save_private_key=True)
'{"account": {"body": {"key": {"n": "vtByzpW..."}}}}'

---

export_account_to_file(self, path='.', name='account.json', save_certificate=True, save_private_key=False) : Exports our object as a JSON file.

• :param path [str]: the directory path to save the account file. Defaults to current working directory.

• :param name [str]: the file name. Defaults to account.json.

• :param save_certificate [bool]: indicate whether the certificate should also be stored in the JSON file.

• :param save_private_key [bool]: indicate whether the private key should also be stored in the JSON file.

• :return [none]: the file will be created at the specified path if an exception was not raised.

• :raises InvalidPath: when the requested directory path to export the account to does not exist.

Example

>>> client.export_account_to_file(
...     path="/tmp/",
...     name="my_acme_account.json",
...     save_certificate=True,
...     save_private_key=True
... )

---

generate_csr(self) : Generates a new CSR using the object's domains and private_key values.

• :return [bytes]: the encoded CSR PEM data string. This method will update the csr property of the object with the same value.

• :raises InvalidDomain: when no valid domains are set.

• :raises InvalidPrivateKey: when no private_key exists for this object.

Example

>>> client.generate_csr()
b'-----BEGIN CERTIFICATE REQUEST-----\nMIHxMIGZAgECMAAwWTATBgckjkn...'

---

generate_private_key(self, key_type='ec256') : Generates a new RSA or EC private key.

• :param key_type [str]: the requested private_key type. Options are: [ec256, ec384, rsa2048, rsa4096]

• :return [bytes]: the encoded private key PEM data string. This method will update the private_key property of the object with the same value.

• :raises InvalidKeyType: when an unknown/unsupported key_type is requested

Example

>>> client.generate_private_key(key_type="ec384")
b'-----BEGIN EC PRIVATE KEY-----\nMIGkAgEBBDAZRFNLcQdVJmLh42p8F4D92...'

---

generate_private_key_and_csr(self, key_type='ec256') : Generates a new private key and CSR.

• :param key_type [str]: the requested private_key type. Options are: [ec256, ec384, rsa2048, rsa4096]

• :return [tuple]: first value contains the key, the second value contains the CSR. This method will update the private_key and csr properties of this object with the same values.

Example

>>> client.generate_private_key_and_csr(key_type="rsa2048")
(b'-----BEGIN PRIVATE KEY-----\nMIIEvAIBA...', b'-----BEGIN CERTIFICATE REQUEST-----\nMIHxM...')

---

new_account(self) : Registers a new ACME account at the set ACME directory URL. By running this method, you are agreeing to the ACME servers terms of use.

• :return [none]: the account and account_key properties will be updated with the new account registration.

• :raises InvalidDirectory: if this object does not contain a valid ACME directory URL.

• :raises InvalidEmail: if this object does not contain a valid email address to use during registration.

Example

>>> client.new_account()

---

request_certificate(self, wait=0, timeout=90) : Requests a final verification answer from the ACME server and requests the certificate if verification was successful. If you request the certificate before DNS has propagated and verification fails, you must start the verification process over entirely by requesting new verification tokens.

• :param wait [int]: amount of time (in seconds) to wait before requesting a challenge answer from the server. This is only necessary if you are not using the check_dns_propagation() method to verify the DNS records exist and would rather wait a specific amount of time.

• :return [bytes]: the PEM encoded certificate. This method will update the certificate and csr property of this object with the same value.

• :raises InvalidAccount: when account registration has not been set.

Example

>>> client.request_certificate()
b'-----BEGIN CERTIFICATE-----\nMIIEfzCCA2egAwI...

---

request_verification_tokens(self) : Requests verification tokens from the ACME server for each domains value. These tokens must be uploaded as a DNS TXT record for each corresponding domain to complete verification.

• :return [list]: a list of tuples containing the challenge FQDN and it's corresponding verification token.

• :raises InvalidAccount: when account registration has not been set.

Example

>>> client.request_verification_tokens()
[
    ('_acme-challenge.test1.example.com', 'moY32lkdsZ3VWHM1mdM...'),
    ('_acme-challenge.test2.example.com', 'asldfkjslweietj23_b...')
]

---

revoke_certificate(self, reason=0) : Attempts to revoke the existing certificate from the issuing ACME server.

• :param reason [int]: the numeric reason for revocation identifier.

• :return [none]:

• :raises InvalidCertificate: if this object does not contain a certificate.

• :raises acme.errors.ConflictError: if the certificate is already revoked.

Example

>>> client.revoke_certificate()